What is it about?
Barium ferrite-silica (BaM-SiO2) nanocomposites of different molar ratios by high-energy ball milling, followed by heat-treatment at different temperatures were studied. The microstructure, morphology and magnetic properties were characterized for different synthesis conditions by using (XRD), (SEM) and (VSM). The results indicate that 15 h of milling was enough to avoid the generation of hematite phase and to get a good dispersion of barium ferrite particles in the ceramic matrix. The highest saturation magnetization (Ms) value obtained was 43 emu/g and the corresponding coercivity (Hc) value of 3.4 kOe for the composition 60BaM-40SiO2 milled for 15 h and heat treated at 900 °C. This coercivity value is acceptable for the application in magnetic recording media.
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Why is it important?
M-type BaM, have the lowest price per unit of magnetic energy and are used for numerous applications such as permanent magnets, particulate media for magnetic recording and microwave devices due to its excellent chemical and physical properties such as large magnetocrystalline anisotropy, high curie temperature, acceptable mechanical hardness, excellent chemical stability, relatively large saturation magnetization and high-corrosion resistance
Perspectives
One of the challenges of BaM is to reduce the grain size for applications in high density magnetic recording media. In this work, we report the synthesis of BaFe12O19-SiO2 nanocomposites with different ratios processed by high-energy ball milling and its characterization studies. To our knowledge this study presents first time the synthesis of BaM-SiO2 nanocomposites by high-energy mechanical milling. The effect of milling time and heat treatment conditions on the microstructure and magnetic properties of ceramic BaM-SiO2 nanocomposites is discussed.
Dr Miguel Ángel Aguilar González
Center for investigation and advanced studies of national polytechnique institute
Read the Original
This page is a summary of: Synthesis and characterization of barium ferrite–silica nanocomposites, Materials Characterization, October 2013, Elsevier,
DOI: 10.1016/j.matchar.2013.06.021.
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